题目内容
一列简谐横波如图所示,t1时刻的波形如图中实线所示,t2时刻的波形如图中虚线所示,已知Δt= t2— t1=0.5s,问:
(1)若波向左传播,则这列波的传播速度是多少?
(2)若波向右传播,且4T<Δt<5T,波速是多大?
(3)若波速等于100m/s,则波向哪个方向传播?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414000655412171.png)
(1)若波向左传播,则这列波的传播速度是多少?
(2)若波向右传播,且4T<Δt<5T,波速是多大?
(3)若波速等于100m/s,则波向哪个方向传播?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414000655412171.png)
(1)
(n=0,1,2,3…)(2)68m/s(3)
则波向右传播
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241400066001182.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241400066471012.png)
(1)当波向左传播时,
(n=0,1,2,3…) (2分)
传播的速度为:
(n=0,1,2,3…) (2分)
(2)若波向右传播,
(n=0,1,2,3…) (2分)
若要满足4T<Δt<5T,则n取4,
(2分)
得
(2分)
(3)若波速为100m/s时,
(1分)
则波向右传播 (2分)
本题考查的是间歇横波图像,当波向左传播时一共向前传播了
,若波向右传播,
,需要满足4T<Δt<5T,若波速为100m/s时,可算出传播的距离,得出一共是多少个波长来判断波的传播方向。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241400067251310.png)
传播的速度为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241400066001182.png)
(2)若波向右传播,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140006819744.png)
若要满足4T<Δt<5T,则n取4,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140006881833.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140006928900.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140006990590.png)
(3)若波速为100m/s时,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140007068943.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241400066471012.png)
本题考查的是间歇横波图像,当波向左传播时一共向前传播了
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241400071621210.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140006819744.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目